Floating Differential Connections
NI 9220
AI+
AI–
COM
Voltage
Source
1 MΩ
Resistor
+
–
Connect the negative lead to COM through a 1 MΩ resistor to
keep the signal source within the common-mode voltage range.
The NI 9220 does not read data accurately if the signal source is
outside of the common-mode voltage range.
14 | ni.com | NI 9220 Getting Started Guide
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